Fix default for whiteSpace.after.PropertyName. Fixes #59

Removes whitespace between property names and the colon, to
match the Google JS Style Guide which the default preset implements.
Always check whitespace around FunctionExpressionOpeningBrace. Fixes #64

This removes half the exception of FunctionExpression inside CallExpression.
While it's intended as a bugfix, it also changes a few unrelated tests to
match that style. This looks like a better default, matching what jQuery does,
and afaik not contradicting anything in the Google JS Style Guide.
Merge pull request #62 from jzaefferer/iss-59

Fix default for whiteSpace.after.PropertyName.
Merge pull request #65 from jzaefferer/iss-64

Always check whitespace around FunctionExpressionOpeningBrace.
add new line at EOF (function_expression) to avoid errors.
add info about EditorConfig to CONTRIBUTING.md